Re: [netmod] update on "rdns" URN for enterprise YANG models

["Ing-Wher (Helen) Chen" <[e-mail]>]

Section 4 of the draft <https://tools.ietf.org/html/draft-chen-rdns-urn-06#section-4> 
documents why a URN is better than  URL as a namespace.  While a URL is globally
unique, a URL is also a resource locator, providing access information.  For an enterprise
that does not wish to publish the access information of its YANG models, a URN is a better
choice.

As required by RFC 3406, Section 3 of the draft, at the bottom of page 5
<https://tools.ietf.org/html/draft-chen-rdns-urn-06#page-5> under "Identifier Persistence
Considerations", addresses the question of identifier persistence.  The main concern
for "identifier persistence" is in the case where an identifier is used for global resolution.
Because YANG model namespaces do not provide global resolutions (actually YANG
model namespaces are only used to uniquely identify a model within a device),
the identifier persistence consideration is not as crucial.  (Please see RFC 3406
top of page 13 <https://tools.ietf.org/html/rfc3406#page-13> for the identifier
persistence discussion.)

Thanks,
Helen

> -----Original Message-----
> From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-
> university.de]
> Sent: Friday, April 15, 2016 11:23 AM
> To: Ing-Wher (Helen) Chen <[e-mail]>
> Cc: [e-mail]
> Subject: Re: [netmod] update on "rdns" URN for enterprise YANG models
> 
> Hi Helen,
> 
> can you explain why
> 
>   urn:rdns:de:jacobs-university:foo
> 
> is from a technical perspective significantly better than
> 
>   http://jacobs-university.de/foo
> 
> also considering that domain names are not stable identifiers but subject to
> changing ownerships or limited lifetimes (and hence a URN embedding
> domain names has the same stability properties)?
> 
> /js
> 
> On Fri, Apr 15, 2016 at 02:59:30PM +0000, Ing-Wher (Helen) Chen wrote:
> > Hello,
> >
> > At IETF94 in Yokohama,  I presented an idea to allow enterprise YANG
> > models to easily generate globally unique namespaces
> > (https://datatracker.ietf.org/doc/draft-chen-netmod-enterprise-yang-
> namespace/) .
> >
> > The topic was also discussed on the mailing list:
> >
> https://mailarchive.ietf.org/arch/msg/netmod/JQmD8yrUeuAwuHpBnqZV_
> mcuv
> > eU
> >
> https://mailarchive.ietf.org/arch/msg/netmod/GSz_1dp2R3FPlMmu2_HF3ZI
> wr
> > sY
> > https://mailarchive.ietf.org/arch/msg/netmod/tJDZPI9PV1-
> SjZm2c608OQu41
> > ws
> >
> https://mailarchive.ietf.org/arch/msg/netmod/RCYhzKvMd0BATTtxaE69nbv
> cj
> > 7g
> >
> > As promised, I started the process of registering the top-level "rdns"
> namespace.
> > Following RFC 3406, I wrote
> > https://datatracker.ietf.org/doc/draft-chen-rdns-urn/
> > and completed the review on [e-mail] .  For the review on
> > [e-mail] , please see the following messages.
> >
> > The final message stating the review is complete is here:
> > https://mailarchive.ietf.org/arch/msg/urn-nid/-Dwx-2JBd-
> eTA4ONNiwaJhUP
> > mcs
> >
> > The review in its entirety is here:
> > https://mailarchive.ietf.org/arch/msg/urn-
> nid/N3Md2evqFPE2o7figeGcyqT4
> > BsY
> > https://mailarchive.ietf.org/arch/msg/urn-
> nid/wEIRTDvf4vPJPW9ORw6lkK6S
> > t2A
> > https://mailarchive.ietf.org/arch/msg/urn-
> nid/btXpEnmt7LHL4ZeCUvxYLQPU
> > ps4
> > https://mailarchive.ietf.org/arch/msg/urn-nid/52U72G2qzuqEwfSVIkD9YE-
> P
> > v3c
> > https://mailarchive.ietf.org/arch/msg/urn-
> nid/_AHANMEp_uq9ZFI7bHzf7lVv
> > poM
> > https://mailarchive.ietf.org/arch/msg/urn-nid/UgfKVlPS87x-1j2juHI8jLHd
> > mAY
> > https://mailarchive.ietf.org/arch/msg/urn-nid/fFjwJMup43-
> P4mGQ4GMnG5Ds
> > rdM
> > https://mailarchive.ietf.org/arch/msg/urn-nid/sRpdhqpw-
> t4t0A15svbM_eyw
> > Gj8
> > https://mailarchive.ietf.org/arch/msg/urn-nid/pibno5XNyXvAhuJ9bW6lKJjD
> > A0w
> > https://mailarchive.ietf.org/arch/msg/urn-nid/-Dwx-2JBd-
> eTA4ONNiwaJhUP
> > mcs
> >
> > Thanks,
> > Helen
> >
> > _______________________________________________
> > netmod mailing list
> > [e-mail]
> > https://www.ietf.org/mailman/listinfo/netmod
> 
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   [phone]         <http://www.jacobs-university.de/>